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Pharmacokinetics, Safety, and Tolerability of Single Intravenous Infusions of an Adenosine Agonist, AMP 579, in Healthy Male Volunteers
Author(s) -
Zannikos Peter N.,
Baybutt Robert I.,
Boutouyrie Bruno X.,
Shah Bharti,
Hunt Thomas L.,
Jensen Bradford K.
Publication year - 1999
Publication title -
the journal of clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 116
eISSN - 1552-4604
pISSN - 0091-2700
DOI - 10.1177/00912709922011818
Subject(s) - tolerability , pharmacokinetics , medicine , volume of distribution , heart rate , urine , pharmacodynamics , adverse effect , placebo , pharmacology , adenosine , agonist , anesthesia , blood pressure , receptor , alternative medicine , pathology
The pharmacokinetics of an adenosine agonist, AMP 579, following intravenous administration were evaluated. Single AMP 579 doses of 20 to 150 μg/kg were infused intravenously over 6 hours using a constant‐rate or two‐step rate of infusion to healthy male volunteers. Plasma and urine samples were collected for measurement of AMP 579 concentration using a validated HPLC assay. An assessment of safety and tolerability was also performed. Based on a noncompartmental method of analysis, the pharmacokinetics of AMP 579 were characterized by rapid systemic clearance (0.77 to 0.85 L/h/kg), a moderate steady‐state volume of distribution (0.80 to 0.94 L/kg), and a short terminal elimination half‐life (0.84 to 1.13 h). AMP 579 exhibited dose (infusion rate)‐proportional pharmacokinetics over the dose range. In addition, little or no unchanged AMP 579 was found in the urine. The primary cardiovascular pharmacodynamic response that was observed was a dose‐related increase in mean ventricular heart rate. Fifteen minutes prior to the end of the infusion, volunteers administered the highest dose (150 μg/kg) exhibited a mean (range) 59% (36%‐69%) increase in heart rate as compared to a mean (range) 18% (0%‐73%) increase for the placebo group. No clinically relevant changes in the systolic or diastolic blood pressure were observed. The information obtained in this study should allow the design of AMP 579 dosage regimens that would maximize plasma AMP 579 concentrations and minimize the incidence of adverse events.